-
I think the top of that cabinet is acting as a soundboard. Stiffening it to increase the resonant frequency and reduce the amplitude of any excitation should help, damping both the soundboard and the way it couples to the turntable wouldn't hurt.
Plenty of people have run bigger speakers closer to a deck, so it's unlikely that direct acoustic coupling across the air gap is the issue.
Help! (Version 2)
I wall-mounted the speakers, after much agonising/domestic debate with my partner. I did test them with a record to check for feedback given the closeness and it seemed like nothing was coming through. Unfortunately (lucky me) it seems that that record was an outlier and they are simply too close and I’m getting more feedback when then when I had them on the floor.
What do people suggest?
I think my options are:
1.) try and mount the speakers higher next to
The shelves. Maybe get someone in to hide the wiring in the wall. Because of the door, I can’t go much wider, unless I move everything to the left. Even then, I think that only offers about 10cm more room
2.) move the turntable to the corner pictured, with the rest of the hi-fi. Ideally on shelving separately.
3.) other ideas? I think it’s the proximity rather than the isolation that’s the issue. It’s only 20cm to the turntable from the speakers